[PATCH net-next] selftests: net: do not detect PPPoX loopback
From: Qingfang Deng <hidden>
Date: 2026-06-03 06:18:00
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, networking [general], ppp protocol drivers and compressors, the rest · Maintainers:
Shuah Khan, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
By default, pppd attempts to detect loopbacks on the underlying
interface using a pseudo-randomly generated magic number and checks if
the same value is received. The seed for the PRNG is a hash of hostname
XOR current time XOR pid, which is likely to collide on NIPA, causing
false positives. Disable magic number generation.
Reported-by: Matthieu Baerts <matttbe@kernel.org>
Fixes: 7af2a94f4dcf ("selftests: net: add tests for PPPoL2TP")
Signed-off-by: Qingfang Deng <redacted>
---
tools/testing/selftests/net/ppp/pppoe-server-options | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/net/ppp/pppoe-server-options b/tools/testing/selftests/net/ppp/pppoe-server-options
index 66c8c9d319e9..cd586be7061b 100644
--- a/tools/testing/selftests/net/ppp/pppoe-server-options
+++ b/tools/testing/selftests/net/ppp/pppoe-server-options@@ -1,2 +1,3 @@ noauth noipdefault +nomagic
--
2.43.0